I'm coming back to the U.S. for a month or so and would like to get a pre-paid data plan for my iPad. However, AT&T screwed me when we moved to Australia, so I'm not interested in anything from them. I'm looking for something like 30 days/<1GB. I haven't paid much attention to U.S. mobile phone companies or plans, so I'm not too familiar with what plans work with the iPad over there and who uses micro-SIMs. Any suggestions? Thanks.